Diff: main.cpp

Revision:

3:bb920a8eb590

Parent:

2:cc462c2a54f6

Child:

4:1b82016459ff

--- a/main.cpp	Fri Nov 27 00:42:38 2015 +0000
+++ b/main.cpp	Fri Nov 27 02:03:52 2015 +0000
@@ -1,23 +1,34 @@
+/* ECE4180 Final Project -- mbed Function Generator
+    
+   Platform: mbed LPC-1768
+    
+   Team member: Hanjie Xie
+                Qiuyang Tao
+                Xuefeng Jin
+                Yuqing Peng
+*/
+
+
 #include "mbed.h"
 #include "uLCD_4DGL.h"
 
-// Objects for devices
+//----- Objects for devices----------------------
 Serial pc(USBTX, USBRX);
 uLCD_4DGL lcd(p13, p14, p15);
 AnalogOut  aout(p18);
 DigitalOut dout(LED1);
 
+//-----Global variable used for Func_Gen---------
 const double pi = 3.14;
 float time_interv;
-uint16_t sample = 0;
 int length_waveform=1000;
 uint16_t waveform[1000];
+float x;
 
-int waveform_type=0;
-float freq=2; //Hz
-float amp=1; //Sacle factor, 1=full range
-float offset=0.5;
-float x;
+//-----User Specified, change it if needed-------
+int waveform_type=0; //0 for sine, 
+float freq,amp=1,offset=0.5;
+
 
 void initialize_LCD(){
     lcd.baudrate(3000000);
@@ -28,49 +39,43 @@
     lcd.printf("Fun Generator Demo"); 
 }
 
-void generate_waveform_datapoints(){
+void generate_waveform_datapoints(){ //Generate data points for the waveform
     float t=0;
     time_interv=1.0/freq/length_waveform;
      
+    //------if sine wave--------
+    if (waveform_type==0){  
+        for (int datapoint_counter=0; datapoint_counter<length_waveform; datapoint_counter++){
+            x=amp*(cos(2*pi*freq*t)+1);
+            waveform[datapoint_counter]=(uint16_t) (x*32767);      
+            t += time_interv;
+        }
+    }
+    
+    //------if other wave--------   
+}
+
+void output_waveform_datapoints(){  //Output the data points using DAC (pin18)
+    time_interv=1.0/freq/length_waveform;
     for (int datapoint_counter=0; datapoint_counter<length_waveform; datapoint_counter++){
-        x=amp*(cos(2*pi*freq*t)+1);
-        waveform[datapoint_counter]=(uint16_t) (x*32767);
-        
         aout.write_u16(waveform[datapoint_counter]);
-        t += time_interv;
-        
         wait(time_interv);
     } 
 }
 
-void output_waveform_datapoints(){
-
-
-    
-}
-
 
 
  
 int main(void){
-    
+    waveform_type=0; //0 for sine, 
+    freq=2; //Hz
+    amp=1; //Sacle factor, 1=full range
+    offset=0.5;
     initialize_LCD();
     generate_waveform_datapoints();
     
-    
-
-
     while (1){
-        
-        generate_waveform_datapoints();
         output_waveform_datapoints();
-        
-        
-        /*for (float t = 0.0f; t < 1/freq; t += 1/fs) {
-            x=amp*(cos(2*pi*freq*t)+1);   
-            sample=(uint16_t) (x*32767);    
-            aout.write_u16(sample);;
-            wait(1/fs);
-        }*/
+
     }
 }